2 The mechanical model is established as a mechanical model of a jaw crusher, in which OA is an eccentric shaft, its length is /1, and the forces (F21)x and (F21)y on it are acting on the crank. To restrain the reaction force, in order to balance F21, the balance weight Gd is added to the crankshafts r1 and Y, and the inertia force is assumed to be FD. The generated inertial force moment is MdAB is dynamic, and its length is /2, F2 The inertia force of the inertial force F2 acting at the centroid of the moving centroid is 02, M2 is the moment of inertia acting on the moving jaw, and F12 and F32 are the restraining reaction forces of the eccentric shaft and the bracket respectively. O1B is a bracket and its length is /3. The self-weight, inertia force and moment of inertia of the bracket are very small compared with other moving parts. Generally, it is omitted when performing force analysis, so the bracket is two-force. The components, that is, the restraining reaction forces F23 and F43 from the frame and the moving jaw. Because the mechanism balance is the attachment caused by the inertia load on the support, female, Hunan Hengyang, a lecturer in the mechanical engineering department of Guangxi Institute of Technology. Since the balance of the pressure is increased, it is not necessary to consider other external forces other than the inertia load (inertia force, moment of inertia) in the force analysis for the balance problem. According to the D'Alembert principle, the inertial load generated by the component can be regarded as an external force acting on the corresponding component that generates the inertial load, so that the mechanism is in dynamic static equilibrium. The mechanism dynamics problem is transformed into a static problem, which is solved by static method. As shown, it is taken as a group, and the bracket is a two-force member. Assuming that the crankshaft rotates at a constant speed, ei=, so the following mechanical equation can be listed: Fi is the resultant force acting on the crankshaft support, ie the additional dynamic pressure generated by the support due to the presence of inertial force, Mk acting on the crank The combined moment on the shaft support, which is balanced by the prime mover and is not taken into account when calculating the counterweight of the mechanism. 3 Optimization model establishment 3.1 Design variable The position of the balance weight added to the flywheel can be determined according to the structure, that is, the direction ri of the balance weight is predetermined. The balance weight GD and the direction angle Y of the radial direction are taken as design variables: 3.2 The objective function is the minimum value of the maximum value of the resultant force Fi acting on the crank axle bearing: 3.3 Constraint The boundary constraints of the two design variables are: G2 - Gd > 0 means that the upper limit of the balance weight Gd is K G2; 2tt - x2 > 0, which means that the upper limit of the direction angle Y is 2nK, which is taken by the designer, where K is taken as 0.4. For example, the double-cavity jaw crusher has a schematic diagram of the movement mechanism and the length of the member according to the relevant data. Machinery, 1994 Liao Hanyuan, Kong Jianyi, Niu Guohui. Jaw crusher. Beijing: Mechanical Industry Press, 1998 Luo Hongping, mother Fusheng. Research on kinematics characteristics of double cavity jaw crusher. Mining Machinery, 2006, (1): Zhao Xianqiong, Yang Xiaohong. The application of Matlab in mechanical optimization design. Journal of Yueyang Normal University (Natural Science Edition), 2000 Dai Shaosheng. The centrifugal inertia force of the jaw crusher is eliminated.
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The size and weight of the mounting position, the eccentric shaft rotation unevenness is reduced, the vibration force and the machine base suffered minimize overall machine to improve the comprehensive overview of a jaw crusher is widely used in mining, metallurgical , building materials, chemical industry, and these industries amount of material to be broken is also increasing rapidly, so make the crusher can work more effectively, when the crusher design, kinetic parameters need for it: institutional balance weight, The rod spring calculates the load and the moment of inertia of the flywheel for optimal design. Since the jaw crusher periodically excites the frame during operation, this excitation will cause the machine and foundation to vibrate, which will accelerate the wear of the machine and reduce the life of the machine. In order to minimize the vibration generated by the inertial force of the jaw crusher, a mass balance block is generally added to the flywheel or the pulley. In this paper, the optimization function of Matlab is used to optimize the design of the balance weight of a PE double-cavity jaw crusher in Matlab environment. The quality and direction angle of the balance block are adjusted to the optimal value by optimization calculation, so that the position of the mechanism is The varying vibrational forces are minimized.
February 09, 2024